Interesting effect. Many of the comments here seem to be upset about the price, well, make your own and sell it for $200. Lens baby sets their own pricing.
As for the look of the lens, I have an old 50mm f1.4 OM lens that has some of the “glowy” feel. It can be used in many many ways.
Right now I am shooting a series of portraits for an organization to go alongside quotes from the sitters. Not knowing what the quots are, in 20mins per sitter I have been working to get a few expressions and am using 2 lenses. the 12-40 m.ziuko and the aforementioned 50mm f1.4
The result is two very different feels to the portraits, a drawing of the image that expends not just to the sharpness or lack of, but from the in-focus to the out of focus a very different feel. Well worth experimenting with.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.